Device for curing a pipeline lining

ABSTRACT

The invention relates to a device (10) lot curing a pipeline lining, wherein the pipeline lining comprises a resin which is curable by means of electromagnetic radiation of a specified wavelength or of a specified wavelength range, comprising a housing (11) with a first (12) and a second (14) opposite end piece and with a housing body (16) which extends between the end pieces (12, 14) and with an electrical current and cooling fluid feed line which is connected to die first end piece (12), wherein the housing body (16) has radially extending arms (26), on the outer end surfaces of which here is arranged in each case at least one light-emitting diode (28), which light-emitting diodes emit light of the specified wavelength or of the specified wavelength range and are connected to the electrical current feed line, and wherein, between the arms (26), the housing (10) has cooling fluid passage openings (32) which are coupled to the cooling fluid feed line and which extend in a longitudinal direction at least in certain sections through the housing body (16), wherein the cooling fluid passage openings (32) are delimited radially to the outside in the region of the housing body (16) by longitudinal webs (24), and wherein, between the longitudinal webs (24) and the arms (26) and/or the light-emitting diodes (28) arranged on the arms (26), there is at least one gap-like outlet opening (34), which extends in a longitudinal direction, for the cooling fluid.

The invention relates to a device for curing a pipeline lining, whereinthe pipeline lining comprises a resin, which is curable viaelectromagnetic radiation of a specified wavelength or a specifiedwavelength range, comprising a housing having a first end piece and asecond, opposing, end piece and a housing body, which extends betweenthe end pieces, and a power and cooling-fluid supply line, which isconnected to the first end piece. When rehabilitating pipes, a knownmethod is to insert a tube material (a so-called liner), which is soakedwith resin, into the pipe to be rehabilitated and to press it againstthe inside wall until the resin has cured.

Suitable liner materials are known under the name Brawoliner byKarl-Otto Braun GmbH, Wolfstein, Germany and are described, for example,in DE 10 2015 212 025 A1 or EP 0 875 713 A1. These liner materials maypreferably be inserted into the pipe to be rehabilitated in an inversionprocedure. In this case, an initially inverted tube, which is soakedwith resin, is blown into the pipe to be rehabilitated such that, in thepipe, the side of the tube which was initially on the inside establishesthe contact between the tube material and the inside wall of the pipe.In an inversion method, as is known in the prior art, a tubular liningmaterial is coated with a curable resin on the inside by pouring resininto the tube. The tube is then compressed for even distribution of theresin and, in particular, to provide an even layer thickness, and, forexample, wound into a so-called inversion drum, wherein the inversiondrum is connectable to a so-called inversion bend, which can beintroduced into the pipe or channel to be rehabilitated. In this case,the one end of the tubular lining material is turned inside out aroundthe end of the tubular inversion bend and fixed thereon. As a result ofintroducing a fluid, the tubular lining material is then introduced intothe pipeline or the channel whilst being simultaneously inverted.Liquids or gases, preferably water or air, may be used as the fluid.

If necessary, provision may be made to additionally use a supportingtube as part of the lining material. The supporting tube is installedsuch that it comes to lie inside the other lining material, namely atube liner, in the pipeline.

The supporting tube is then preferably used if the second, normallyclosed, end of the lining material cannot be closed, because it is notaccessible after the completed rehabilitation and can therefore not beopened.

Before installation, the second end, which comes to lie in therehabilitated pipeline in the installed state, is normally closed sothat fluids can be introduced and the curing material can therefore beapplied to the pipeline to be rehabilitated. This end is later removedin order to make the pipeline continuous. If closure of this end cannotbe provided for rehabilitation reasons, the previously describedadditional supporting tube may be installed, the corresponding end ofwhich is then closed. By introducing fluids, either liquids or gases,into the lining material, the lining material is applied to the wall ofthe pipeline and fixed thereto by means of the resin and hardened there,so that a completely new pipe is then produced in the pipe. On theinside of the installed lining material, a layer may furthermore beprovided, which is resistant to the substances which are to besubsequently conducted through it and which, in particular, preventsdeposits.

The originally outer side forms the inside of the lined pipe aftercompletion of the inversion procedure.

The terms pipe, pipeline, channel or channel line are used analogouslybelow.

The terms pipe lining, pipeline lining and liner are likewise usedanalogously.

To cure the resin, in addition to heating the lining material in orderto accelerate or initiate the curing process, it is known to conductsteam through the lining material, without needing to release orsubstantially influence the pre-existing pressure therein, since thismay cause the lining material to collapse.

A corresponding approach is known from WO 2007/044052 A2; however, it ispreferably only provided once the lining material has been installedand, in particular, for this approach, an opening has to be cut into thelining material. Since, at this point, the lining material is not yetfully cured, additional difficulties may arise. In particular, thecuring process at the required temperature may take a period of severalhours, during which the drive must be kept in operation.

Resin materials which contain a photoinitiation system have beenavailable for some time, whereby the curing procedure may be initiatedand accelerated through the effect of electromagnetic radiation ratherthan the thermal system. Following irradiation, the curing proceduretakes place within a few minutes. To initiate the curing procedure, aradiation source is guided along the pipe, which is equipped with aliner. In this case, the guiding speed is selected such that the amountof radiation is sufficient to initiate the curing procedure. Thisprocess is much less time-consuming than the method described above.

With the development of LED technology, it has become possible toconstruct energy-saving light sources with a small spatial requirement.Specific problems arise in that, despite their comparatively high energyefficiency, the LED lamps still give off significant amounts of heat,which may cause a significant increase in temperature in the pipe to berehabilitated, whereby overheating of the LEDs may occur to the pointwhere the LEDs fail, which means that the rehabilitation has to bediscontinued.

Therefore, the devices used require efficient cooling systems for theLED lamps. Such devices for internal pipe rehabilitation by means oflight curing are described for example in EP 2 129 956 A1, whichdiscloses a device and a method for curing a lining of a pipeline. Thedevice comprises a cylindrical housing, on the outer wall of which LEDsare evenly arranged. The housing has an internal passage, in whichheat-dissipating elements are arranged. The heat-dissipating elementsare in communication with the externally mounted LEDs and transport theheat thereof into the interior of the device. A cooling fluid thereinflows through the device and past the heat-dissipating elements.

EP 3 321 554 A1 furthermore describes a device for light-curing a linermaterial. The device has LEDs, which are provided with heat-dissipatingelements on the inside.

Coolant flows through the heat-dissipating elements and thus results incooling of the LEDs.

An LED head for use in internal pipe rehabilitation is described in EP 3236 129 A1. The LED head has a housing, on the outer surface of whichLED modules are mounted. Coolant flows in a central channel through thehousing and is conducted outwards through radially arranged channels.

A method in which a curing device, together with a liner, is installedin a pipe to be rehabilitated is described in WO 2019/036044.

The object of the present invention is now to provide a device forcuring liner materials for internal pipe rehabilitation, which ensuresefficient heat dissipation in a simple manner.

The invention achieves this object by means of a device having thefeatures of claim 1. In this case, the device having the features of theprecharacterizing clause of claim 1 has radially extending arms in thehousing, on the outer end faces of which at least one, in particularmultiple, radiation sources, in particular light-emitting diodes (LEDs),are arranged in each case, which emit or radiate radiation, inparticular light of the specified wavelength or the specified wavelengthrange, and are connected to the power supply line, wherein the housinghas cooling-fluid passage openings between the arms, which cooling-fluidpassage openings are coupled to the cooling-fluid supply line so thatcooling fluid may enter during operation, and wherein the cooling-fluidpassage openings extend in the longitudinal direction at least incertain sections through the housing body. The passage openingspreferably extend through the entire housing body, in particular in theregions in which the LEDs are arranged. The cooling-fluid passageopenings are delimited radially outwards by longitudinal webs in theregion of the housing body, wherein, between the longitudinal webs andthe arms, and/or the longitudinal webs and the light-emitting diodesarranged on the arms, there are one or more gap-like outlet openings forthe cooling fluid, which extend in the longitudinal direction.

Therefore, the gap-like passage opening may extend, for example, overthe entire length of the housing body between the end pieces, inparticular in the region in which the LEDs are arranged. In this case,the gap-like passage opening may have a continuous or interrupted form.With an interrupted configuration, the cooling fluid may be even betterdiverted to the LEDs to be cooled and may be used even more efficiently.To this end, separating elements may be provided on the longitudinalwebs, which separating elements interrupt the gap-like passage openings.The separating elements may be radially inwardly extending components,which close the gap-like openings in this region.

The invention is explained below with reference to light-emittingdiodes. However, in this case, part of the invention also involves theuse of other radiation sources, which fall within the visible spectrum,but also within the UV or IR spectrum. Other forms of radiation, such asmicrowaves, may likewise be provided. Within the scope of the invention,the term LED shall likewise include such radiation sources.

The advantage consists in that, unlike the known cooling, in which thecooling fluid is guided over one or more cooling elements, via which theheat of the LEDs, which is generated by the heat losses of the LEDs, isconducted to the cooling fluid, according to the invention, the coolingfluid, in particular a gas, is conducted through the passage openingsand cools the LEDs directly the LED. According to the invention, theheat transfer is realized via heat convection and not heat conduction.By way of the gap-like outlet openings, the cooling fluid exits directlyin the region of the LEDs and flows over them. As a result of thegap-like configuration, the cooling fluid is preferably accelerated asif through a nozzle, whereby the heat dissipation is further improved.The flow over the LEDs is thus improved and more effective cooling isachieved.

The arms are preferably arranged in a star shape (radiallysymmetrically) and extend from the center of the housing body to itsoutside, wherein eight arms, and therefore eight cooling-fluid passageopenings, are preferably provided, which extend through the housingbody. The passage openings extend between the arms. The passage openingsand the arms are adapted to one another in terms of their shape. In thisregard, the passage openings may be substantially circular incross-section or they may have a form which widens radially outwardsfrom the center, rather like a slice of pie. Moreover, configurationshaving more or fewer than eight passage openings are also conceivable,wherein both an even and an odd number may be provided. Although thearms and the passage openings are preferably radially symmetrical, otherconfigurations are also conceivable, in which the arrangement is not aneven arrangement around the circumference or is not equidistant.

In this case, the longitudinal webs may have different cross-sectionalforms. Triangular cross-sections are preferable, wherein two pointsserve to form the gap-like outlet openings, and therefore point in thedirection of the LEDs or the arms which support the LEDs, and one pointpoints radially outwards. The cooling fluid is conducted particularlywell due to the fact that a surface of the longitudinal webs thendelimits the passage openings. Alternatively, flat configurations areconceivable, in which the outwardly directed point is not present or isrounded.

It is preferably provided that, in particular, three or more LEDs arearranged on each end face of an arm. Alternatively, however, it ispossible that only one LED is provided for each arm. As stated, insteadof the LEDs, other radiation sources may also be provided, which shalllikewise be subsumed under the term LED within the scope of thisapplication. The LEDs may be provided individually or they may begrouped together as LED modules and installed as modules. In this case,the LEDs of a module may be arranged on a common base plate and they maybe powered and collectively controlled via this base plate.

It is preferably provided that the arms, and therefore the radiationsources and/or the longitudinal webs and/or the outlet openings, extendover the entire length of the housing body. A particularly large area,which may provide radiation for curing, is thus provided, along withoptimal cooling.

Furthermore, it is preferably provided that the second end piece has aclosed form. It is thus ensured that all of the cooling fluid isconducted past the LEDs and is available for cooling purposes. If thesecond end piece does not have a closed form, it must be ensured byother means that the cooling fluid does not escape via the end piece,but is conducted through the gap-like outlet openings in order to thusensure convective cooling of the LEDs. This may be realized via furthercomponents, for example further devices connected downstream oradditional closure means.

The outlet openings may have a width of 0.1 to 10 mm, in particular 0.5to 5 mm and, in particular, 0.7 to 1.1 mm. In this case, the width isunderstood to be the shortest distance between the edge of thelongitudinal edge and the arm or the LEDs or their module carriers. Thewidth of all outlet openings is preferably the same and constant overtheir length. Alternatively, however, the width may also vary over thelength of the housing body. The ratio of the area of the outlet openingsto the cross-sectional area of the passage openings is preferablybetween 1:2 and 1:6, in particular 1:2.5 and 1:4, and in particular1:2.9 and 1:3.1. It is thus ensured that the cooling fluid isaccelerated in the desired manner as it passes through the outletopenings.

For curing the lining material, it is preferred that the LEDs have anemission maximum at a wavelength of 360 to 450 nm, in particular 365 to405 nm and in particular 385 to 405 nm and preferably 395 nm.

The device preferably has a substantially cylindrical form, whereby theinsertion and guidance through the pipe to be repaired or lined isfacilitated. Alternatively, other forms are also conceivable, which aresubstantially rotationally symmetrical but may also have a polyhedralcross-sectional form, for example.

In particular, it is provided that the end pieces have the same diameteras the housing body. In this case, the diameter of the housing body isdetermined in particular by the longitudinal webs. That is to say thatthe end faces of the arms and also the LEDs are set back with respect tothe longitudinal webs in this case. It is thus achieved that the LEDsare at the required spacing from the pipe wall or from the liningmaterial, so that the LEDs are not damaged, on the one hand, and curingis reliably ensured.

According to one configuration, the housing may have a central channel,which is surrounded by a housing surface from which the arms extendradially outwards. In this case, the electrical supply, and also furthercomponents, for example plugs or other electrical connections, may beprovided in the channel.

According to one embodiment, the end pieces and the longitudinal websmay be formed together in one piece.

Likewise, according to the invention, the device may be configured inmultiple parts or in one part. The one end piece or both end pieces maypreferably be configured in multiple parts. If the first end piece is inmultiple parts, it may be provided that a first end piece element, whichsupports the connection for the cooling-fluid supply line and the powersupply line, is provided. This first end piece element may be insertedinto a further end piece element of the end piece, which may surroundthe first end piece element, for example concentrically, and connectedto the further end piece element to form the end piece. In this case,the two end piece elements might be connected, for example, via screwconnections. Other connection techniques, such as latching connectionsetc., are likewise conceivable.

According to one exemplary embodiment, the pipeline lining may betubular and may comprise, in particular, a textile material, which iscoated or impregnated with a resin.

The curing procedure under irradiation takes place within a few minutes.To initiate the curing procedure, a radiation source is guided along thepipe which is equipped with a liner. In this case, the guiding speed isselected such that the amount of radiation is sufficient to initiate thecuring procedure. This process is much less time-consuming than thecuring method which uses steam or other fluids.

It is particularly preferably provided that the second end piece, inparticular at its end face, has, or can be connected to, anelectromagnet which is coupled to the power supply line and may beenergized thereby. From a certain line length, a device for curing apipe lining material may be exclusively pulled in if it is not drivendirectly at the head. i.e. at the device itself. To this end, a pullcable is fastened to the device. The device is pulled into the line viathis cable. It can only be pulled in if an access is present at thedestination point for manually separating the cable from the device.This means that installation of a liner is not possible with a closedend. In addition, the liner must be pressureless during the separation.By releasing the pressure and building the pressure up again, airbecomes trapped between the pipeline to be rehabilitated and theinstalled liner. This air impairs the quality of the rehabilitation.

As a result of the inventive provision of an electromagnet, whichcooperates with a metallic counter-piece which is coupled to the liner,the separation of the device from the pipe lining may take placeremotely by energizing the electromagnet during the pulling-in procedureand then switching it off so that separation from the metalliccounter-piece takes place. According to one configuration, to this end,before the pulling-in procedure, a steel element as a counter-piece isconnected to a pull cable and mounted on the liner end. The device, inparticular with its second end piece, is guided on this counter pieceand the electromagnet is energized. This causes the magnetic field tobuild up and holds the device on the cable. The device, with the liner,is subsequently pulled, in particular blown (inverted), into the pipe tobe rehabilitated. Once the pipe lining material is installed in the pipeto be rehabilitated, the device is separated from the pull cable byswitching off the magnet and may be removed from the rehabilitated pipeat a desired time by being pulled out again backwards, i.e. in thedirection of the entry point. In this case, the device for curing thepipe lining material is activated during the pulling-out procedure. Thatis to say, in the inventive case in which the resin undergoes UV curingby means of LEDs, the LEDs are switched on and the device is pulledbackwards in the pipe. In this case, the pullback speed is adapted sothat adequate irradiation of the newly produced pipe inside wall, formedby the liner, takes place so that the resin may cure completely. Thepullback speed may preferably be constant over the entire length. Inthis case, the electromagnet may be part of the second end piece or itmay be in particular releasably connected thereto. In this case, theelectromagnet is fixed to the second end piece, and in particular to thefree end face thereof, via a screw connection.

In this case, the electromagnet may be plate-like or ring-like and mayhave, in particular, an external diameter or external dimensions whichare smaller, in particular slightly smaller and, in particular, smallerall-around, than the external dimensions of the second end piece.

The electromagnet is particularly preferably couplable to acounter-piece, which has a means, in particular a passage opening, forconnection to a pulling-in device for pulling the device into thepipeline. The attachment to the pipe lining material may thus berealized in a particularly simple manner.

According to a particularly preferred configuration, the counter-piecemay be in the form of a covering cap for the electromagnet and may coverthis in particular in the manner of a hat. In this case, the means, inparticular the passage opening, may be incorporated in the covering capand, in particular, in its form.

The outer circumferential contour of the counter-piece furthermorepreferably corresponds to the formed outer contour of the second endpiece.

Air, in particular, is used as the cooling fluid. However, other gasesor liquids are also conceivable.

Further advantages and features are revealed in the remaining documentspertaining to the description and the claims.

A preferred configuration is described in the following drawing, inwhich:

FIG. 1 shows a perspective illustration of the device according to theinvention;

FIG. 2 shows a device according to the invention in various viewsaccording to FIG. 1 ;

2 a and 2 b, c, d, e, f show various views of the device;

FIG. 3 shows a device according to FIG. 1 in a partially open state in afirst view;

FIG. 4 shows a further view according to FIG. 3 ; and

FIG. 5 a ), 5 b) show the device according to FIG. 1 during and afterthe inversion procedure.

FIG. 1 shows, in a perspective illustration, a device which is denotedas a whole by the reference sign 10. The device has a housing 11, withtwo end pieces, namely a first end piece 12 and a second end piece 14,and a housing body 16 arranged between them. The housing body 16 and theend pieces 12, 14 have a substantially cylindrical form.

The end pieces 12 and 14 are formed in one piece with longitudinal webs24 of the housing body 16 and are connected thereby. Between thelongitudinal webs 24, the housing body 16 has recesses which are denotedby the reference sign 25. LEDs 28, as radiation sources here, arearranged in the recesses 25, wherein, in the exemplary embodiment, threeLEDs 28 are arranged on a carrier 30 in each case. The LEDs are providedon the carrier 30 at a spacing from one another in the longitudinaldirection. The carriers 30 are connected to the housing body 16 or thedevice 10 via screw connections 31. The LEDs on the carriers 30 formso-called LED modules 29, which are provided in an even, in particularradially symmetrical, distribution around the circumference of thehousing body 16.

The second end piece moreover supports an electromagnet, which, in theillustration shown, is connected to a counter-piece made of anelectrically conductive material, which is coupled to a pull cable (notillustrated) for pulling in the device 10.

A tubular connecting element 50, in the interior of which a connectionfor a cooling-fluid supply line 58 is illustrated, is furthermoreprovided on the side with the first end piece 12. The tubular connectionpiece 50 consists of two half rings, which may be connected to oneanother via a screw connection 51 and which are thus pushed over thecooling-fluid supply line 55 formed as a tube (c.f. FIG. 4 ) and fixthis on the fluid supply line 58.

In this case, the longitudinal webs 24 have a triangular cross-sectionalform, wherein one point points outwards and, with the end pieces 12 and14, forms the lateral surface of the device 10.

In this case, the LEDs 28 point radially outwards, so that they radiateevenly over the circumference and, therefore, as the device 10 is movedthrough a pipeline to be lined and rehabilitated, subject all regions ofa liner material, which has been installed in the pipeline, tocorresponding radiation.

FIG. 2 now shows various views of the device 10 in various illustrationsa) to f). In this regard, illustration a) shows a plan view of the firstend piece 12, wherein the first end piece here is formed by two endpiece elements, wherein a first end piece element 12′ may be insertedinto the further end piece element 12″ and may be fixed therein by meansof screws, the openings for which are shown in illustration b). Theopenings for the screw connection are denoted by the reference sign 54.

Moreover, in illustration a), it is possible to see screw connections 56which correspond to the connection of the inserted end piece element12′. Likewise visible are the fluid feed 58 and elements of theelectrical contacting unit 60, which are visible through the opening ofthe fluid feed 58.

Figure b) shows a plan view of the lateral surface of the device 10,wherein, in contrast to FIG. 1 , the electromagnet 45 is shown here andis not connected to the counter-piece (44) as illustrated in FIG. 1 .The electromagnet is configured in the shape of a plate and is arrangedon the free end face of the second end piece 14. The electromagnet 45has a smaller diameter than the second end piece 14, so that the secondend piece 14 protrudes all-around.

In this case, the magnet is denoted by the reference sign and thecounter-piece, connected thereto, is denoted by the reference sign 44.In this case, the counter-piece 44 has a continuous opening 43, viawhich a fixing procedure (as shown in FIG. 5 ) and a pulling-inprocedure with a liner may take place. The opening 43 for establishing aconnection with the liner is illustrated schematically in FIG. 5 . Thecounter-piece 44 is configured in the manner of a covering cap andcovers the magnet 45 all-around.

The illustration c) shows a section along the line A-A in illustrationa). In this case, it shows the electromagnet and the means forelectrical contacting 60.

The illustrations d) and e) show various cross sections through thesection planes B-B and C-C, wherein illustration d) shows the transitionfrom the central fluid feed 58 into the provided cooling-fluid passageopenings 32, which have a circular form here and are likewise shown inillustration e). In illustration e), a section in the region of thehousing body 16 is now shown, wherein the longitudinal ribs 24 may beseen here with their triangular cross-sectional form, with one pointpointing radially outwards, wherein the further points point in thedirection of the LEDs 28 and the LED carrier 30. Particularly good fluidguidance may thus be achieved, since the outlet openings 34 only have asmall width.

Provided between the longitudinal webs 24 and the LEDs 28 or modules 29or LED carriers 30 are the gap-like outlet openings 34 (alreadymentioned with reference to FIG. 1 ), through which the air from thecooling-fluid passage openings 32 exits outwards and is accelerated dueto the gap-like configuration. In this case, the gap-like outletopenings 34 do not have a continuous form in the longitudinal direction,as can be seen in illustration c), but extend in each case only in theregions in which an LED of the module 29 which is to be cooled isarranged in each case. The effectiveness of the convective cooling ofthe LEDs 28 may thus be even further improved. In the intermediateregions, the outlet openings 34 are closed by components 33, which areshown in illustration c).

In this case, the housing body, starting from a central opening 52, hasradially outwardly extending arms 26, which reach radially outwards andon the outer end faces of which the light-emitting diodes 28 arearranged. Consequently, the arms likewise delimit the passage openings32.

FIGS. 3 and 4 now show two perspectives, illustrating the end pieces 12consisting of two elements 12′ and 12″, namely the first end pieceelement 12′ and the further end piece element 12″, wherein the first endpiece element 12′ is inserted into the further element 12″ and is fixedtherein via the screw connections 54.

The magnetic counter-piece 44, which cooperates with the electromagnet(not shown) when the electromagnet 45 is energized, is likewiseillustrated here.

FIGS. 3 and 4 show the electrical connection element 60, consisting of afirst electrical connection element 61 and a second electricalconnection element 62, which cooperate to establish the electricalcontacting both of the LEDs 28 and the electromagnet 45.

The pulling-in of the device 10 is shown in FIG. 5 . Through theprovision of the electromagnet 45, which cooperates with the metalliccounter-piece 44 which is coupled to a liner 40, the separation of thedevice 10 from the pipe lining 40 may take place remotely by energizingthe electromagnet 45 during the pulling-in procedure and then switchingit off so that separation from the metallic counter-piece 44 takesplace. To this end, the counter-piece 44 is connected to a pull cable(pulling-in device) 46, which is mounted in a corresponding opening ofthe counter piece 44 and whereof the other end is mounted on the linerend 40. The device 10, in particular with its second end piece 14, isguided on this counter-piece 44 and the electromagnet 45 is energized.This causes the magnetic field to build up and holds the device 10 onthe cable. The device 10 is subsequently pulled into the liner 40 andintroduced with this liner (inversed) into the pipe to be lined. Oncethe destination point has been reached, the device 10 is separated fromthe pull cable 46 by switching off the magnet 45 and may be removed fromthe rehabilitated pipe 42 at a desired time by being pulled out againbackwards, i.e. in the direction of the entry point. In this case, ifthe device comprises a curing medium, this may be activated, e.g. UVradiation may be emitted, so that curing of the resin of the liner takesplace. In this case, the pullback speed is determined by the curingproperties. In this case, the electromagnet 45 may be part of the secondend piece 14 or it may be in particular releasably connected thereto. Inthis case, the electromagnet 45 is fixed to the second end piece 14, andin particular to the free end face thereof, via a screw connection.

1. A device (10) for curing a pipeline lining, wherein the pipelinelining comprises a resin, which is curable via electromagnetic radiationof a specified wavelength or a specified wavelength range, comprising ahousing (11) having a first (12) and a second (14), opposing, end pieceand a housing body (16) extending between the end pieces (12, 14) and apower and cooling-fluid supply line, which is connected to the first endpiece (12), wherein the housing body (16) has radially extending arms(26), on the outer end faces of which at least one light-emitting diode(28) is arranged in each case, which light-emitting diodes emit light ofthe specified wavelength or the specified wavelength range and areconnected to the power supply line, the housing (10) has cooling-fluidpassage openings (32) between the arms (26), which cooling-fluid passageopenings are coupled to the cooling-fluid supply line and extend in thelongitudinal direction at least in certain sections through the housingbody (16), the cooling-fluid passage openings (32) are delimitedradially outwards by longitudinal webs (24) in the region of the housingbody, and between the longitudinal webs (24) and the arms (26), and/orthe light-emitting diodes (28) arranged on the arms (26), there is atleast one gap-like outlet opening (34) for the cooling fluid, whichextends in the longitudinal direction.
 2. The device as claimed in claim1, wherein a plurality of LEDs (28), in particular two or more LEDs(28), in particular three LEDs (28), are arranged on each end face ofthe arms (26), which LEDs are grouped together in particular to form LEDmodules (29).
 3. The device as claimed in claim 1, wherein the end facesof the arms (26) are set back with respect to the longitudinal webs(24).
 4. The device as claimed in claim 1, wherein the arms (26) and/orthe longitudinal webs (24) and/or the outlet openings (34) extend overthe entire length of the housing body (16), and the outlet openings (34)may have an interrupted form.
 5. The device as claimed in claim 1,wherein the second end piece (14) has a closed form.
 6. The device asclaimed in claim 1, wherein the outlet openings (34) have a width of 0.1to 10 mm, in particular 0.5 to 5 mm and in particular 0.7 to 1.1 mm. 7.The device as claimed in claim 1, wherein the LEDs (28) have an emissionmaximum at a wavelength of 360 to 450 nm, in particular 365 to 405 nmand in particular 385 to 405 nm and preferably 395 nm.
 8. The device asclaimed in claim 1, wherein the device (10) has a rotationallysymmetrical, and in particular substantially cylindrical, form.
 9. Thedevice as claimed in claim 1, wherein the end pieces (12, 14) areconnected to the longitudinal webs (24) in one piece.
 10. The device asclaimed in claim 1, wherein the housing (11) has a central channel (52),which is surrounded by a housing surface from which the arms (26) extendradially outwards.
 11. The device as claimed in claim 1, wherein anelectromagnet (45) is provided on the second end piece (14), inparticular on the end face thereof, which electromagnet is coupled tothe power supply line and may be energized thereby.
 12. The device asclaimed in claim 2, wherein the end faces of the arms (26) are set backwith respect to the longitudinal webs (24).
 13. The device as claimed inclaim 12, wherein the arms (26) and/or the longitudinal webs (24) and/orthe outlet openings (34) extend over the entire length of the housingbody (16), wherein the outlet openings (34) may have an interruptedform.
 14. The device as claimed in claim 3, wherein the arms (26) and/orthe longitudinal webs (24) and/or the outlet openings (34) extend overthe entire length of the housing body (16), wherein the outlet openings(34) may have an interrupted form.
 15. The device as claimed in claim 2,wherein the arms (26) and/or the longitudinal webs (24) and/or theoutlet openings (34) extend over the entire length of the housing body(16), wherein the outlet openings (34) may have an interrupted form. 16.The device as claimed in claim 15, wherein the second end piece (14) hasa closed form.
 17. The device as claimed in claim 14, wherein the secondend piece (14) has a closed form.
 18. The device as claimed in claim 13,wherein the second end piece (14) has a closed form.
 19. The device asclaimed in claim 12, wherein the second end piece (14) has a closedform.
 20. The device as claimed in claim 4, wherein the second end piece(14) has a closed form.